Work out the size of angle DEF, You must give a reason for your answer (Angles are on the picture below)

Ineeeeed this is due tomorrow and i dont know the answer can you find all the exponents

Which number produces a rationale number when multiplied by 1/5

Afarm that has 4 x 10^2 acres has 1.2 x 10^5 cattle. what is the average number of cattle per acre? write the answer in scientific notation. answere asap